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In order to help you, we need to know a lot of information. Make sure to include answers to at least the following questions in your initial post.

- what OS (Windows Xp/Vista, Mac etc.) are you running?- what FlightGear version do you use?- what graphics card do you have?- does the problem occur with any aircraft, at any airport?- is there any output printed to the console (black window)?- copy&paste your commandline (tick the "Show commandline box on the last page of FGRun or the "Others" section on the Mac launcher).- please upload a screenshot of the problem.

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Here we are again, indeed I am currently experiencing bad FPS on the last stable version of FlightGear (2018.2.1). In Fact, the bad performances started with the first of the 2018 releases. Last time I posted a similar problem, but it was all my fault, a library conflict due to open scene graph from Open Morrowind, but this time it seems not to be mine. Even with lower graphics settings my FPS are around 20. In the 2017 releases it was almost all the time at 60 FPS. This issue is present on all aircraft in all airports.

F10->View->Rendering_options->Shader_Effects... on or off? if on, how do you have the sliders set under the [Shader Options] button? more specifically, the (grass) overlay, water and urban sliders...

also, are you flying with the F10 menu displayed or not?

"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up.""Why not?" said Gurder."Dunno. It's frightened of heights, I guess."

Are the random veg, buildings, pylons, detailed roads disabled? Just to check - if they are then this could be an actual problem.

If you are able to could you launch fgfs,exe from the command line without using the new launcher? I recall someone complaining in the list of bad performance since the launcher was updated. If you compare running without the launcher to the exact same settings aircraft and airport with the launcher is there a significant difference?

And, I just tried to launch only the simulator with the default command (fgfs) with no launcher. And I get a C172P at PHNL with 18 - 20 FPS, so, yes it is basically the same problem with and without the launcher.

If I disable ALS and Advanced weather modeling, I only get 5 - 10 fps more.

Last edited by Dogers on Sun May 27, 2018 8:00 am, edited 1 time in total.

"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up.""Why not?" said Gurder."Dunno. It's frightened of heights, I guess."

"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up.""Why not?" said Gurder."Dunno. It's frightened of heights, I guess."

I just compiled SimGear and FlightGear with the option you've specified and bingo you were right ! My FPS just skyrocketed ! Thank you very much, I can now start to fully enjoy flying with the last stable version of FlightGear !

That is to say, this is issue looks really strange to me. Indeed, I use FlightGear for more than 5 years now, and I never had to put these cmake options before to get it correctly work.

if it is there, on my post above, click the "accepted solution" icon... it'll be on the right near the [QUOTE] and "!" buttons... that'll make the topic as solved...

"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up.""Why not?" said Gurder."Dunno. It's frightened of heights, I guess."

excellent i couldn't really tell from here... i guess because i always use the "New posts" link instead of the "Unsolved Issues" link... thanks!

"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up.""Why not?" said Gurder."Dunno. It's frightened of heights, I guess."